by With the vigorous development of modern industrial technology, the construction of houses can also be standardized and mass manufactured.
It is only necessary to transport the prefabricated standardized housing finished components to the construction site and assemble them to form a complete building, which is called prefabricated building.
Features of prefabricated buildings: 1.
A large number of building components are produced and processed by workshops.
The types of components mainly include: exterior wall panels, interior wall panels, laminated panels, balconies, air conditioning panels, stairs, prefabricated beams, prefabricated columns, etc.
2.
A large number of on-site assembly operations greatly reduce the original cast-in-situ work.
3.
The integrated design and construction of architecture and decoration are adopted.
Ideally, the decoration can be carried out simultaneously with the main construction.
4.
With the standardization of design and informatization of management, the more standard the components are, the higher the production efficiency will be, and the corresponding component cost will be reduced.
With the digital management of the factory, the cost performance of the whole assembled building will be higher and higher.
5.
Meet the requirements of green building.
6.
Energy saving and environmental protection.
After the above introduction, I believe you have a preliminary understanding of prefabricated buildings.
As the general trend of the future development of the construction industry, it is very necessary to start learning about the construction technology of prefabricated buildings as soon as possible.
In the next time, we will share the installation technology of prefabricated buildings every week, and follow you to understand and learn about prefabricated buildings.
In the first phase, we will introduce the installation of prefabricated concrete columns in the framework plate prefabricated buildings.
Installation of precast concrete column: the precast concrete is used to bind the reinforcement and concrete pouring of the structural column in the factory.
The bottom of the column is grouted and connected with the reinforcement reserved on the floor through the reserved holes.
At the same time, the top is also reserved with the reinforcement, which is grouted or overlapped with the slab, beam and other components.
The specific installation process is as follows: 1.
Before lifting the prefabricated column, the laitance and sundries in the binding layer shall be cleaned and the corresponding roughening treatment shall be carried out.
The joint surface shall be treated ▲ 2.
The surveyor shall set out according to the drawing and the floor positioning line, and set out the positioning line of the prefabricated column and the positioning control line 200mm away from the column.
Determine the installation position and control line of the column according to the positioning line ▲ 3.
Clean and position the reserved rebar, use the pre processed accurate rebar positioning frame to position the rebar position and spacing, straighten the skewed rebar, and do not bend the rebar.
Check whether the position of the reserved reinforcement is accurate ▲ 4.
After the positioning of the reinforcement is completed, the level height of the joint surface of the precast concrete column shall be measured, and according to the measurement data, a gasket of appropriate thickness shall be placed to level the lifting plane.
Determine the horizontal elevation of the joint surface ▲ 5.
Before lifting the components, firmly connect the U-shaped clamp with the embedded lifting ring on the top of the column.
The prefabricated column shall be lifted at two points and shall not be lowered until it is 300mm away from the installation position.
Lifting and installation ▲ 6.
Use a mirror to ensure that the rebar is aligned with the hole accurately.
After alignment, the lifting personnel shall hold the prefabricated column and slowly drop it.
Plug in with the reserved reinforcement ▲ 7.
Install the support base at the temporary support reserved nuts on the floor, and check whether the support base is firmly installed.
Use adjustable support rods to temporarily fix the prefabricated column and the floor.
Each member shall be fixed with at least two oblique supports and installed on both sides of the member to ensure that the prefabricated column and the floor plane form a 90 degree angle after the oblique support is installed.
Use a guiding rule to check and ensure that the components are stable before removing the hook.
Installation of inclined support connecting piece ▲ installation of inclined support ▲ 8.
The gap between the prefabricated column and the floor shall be sealed with mortar, and the sealing shall be dense to ensure that there is no leakage during grouting.
Then, only one grout discharge hole is blocked, and the grout pipe is inserted for grouting.
There is only one grout discharge hole in the lower row.
When the grout flows out in a column shape, the grout hole shall be blocked.
Within 24 hours after the grouting operation, the components and grouting joints shall not be subject to vibration or impact.
The red line is the height of grouting liquid level ▲ all grout discharge holes are blocked ▲ the installation is completed ▲ the above is the installation process of prefabricated concrete columns in skeleton plate assembled buildings.
In the next section, we will continue to share the installation process of segmented prefabrication (column column connection) of skeleton plate assembled high-rise PC columns.
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